package providers

import (
	"context"
	"fmt"
	"time"

	"go.uber.org/zap"

	"yanxue_ai_go/pkg/common/ai/types"
	"yanxue_ai_go/pkg/common/logger"
)

// AnthropicModel Anthropic模型实现
type AnthropicModel struct {
	apiKey    string
	baseURL   string
	modelID   string
	modelInfo types.ModelInfo
	config    map[string]interface{}
}

// AnthropicConfig Anthropic配置
type AnthropicConfig struct {
	APIKey  string `json:"api_key"`
	BaseURL string `json:"base_url"`
	Model   string `json:"model"`
}

// NewAnthropicModel 创建Anthropic模型实例
func NewAnthropicModel(config AnthropicConfig) (types.AIModel, error) {
	if config.BaseURL == "" {
		config.BaseURL = "https://api.anthropic.com"
	}

	// 构建模型信息
	modelInfo := types.ModelInfo{
		ID:          fmt.Sprintf("anthropic-%s", config.Model),
		Provider:    types.ProviderAnthropic,
		Type:        types.TypeChat,
		Name:        config.Model,
		Description: fmt.Sprintf("Anthropic %s model", config.Model),
		MaxTokens:   getAnthropicModelMaxTokens(config.Model),
		InputPrice:  getAnthropicModelInputPrice(config.Model),
		OutputPrice: getAnthropicModelOutputPrice(config.Model),
		Features:    []string{"chat", "streaming", "reasoning"},
		CreatedAt:   time.Now(),
		UpdatedAt:   time.Now(),
		Metadata: map[string]interface{}{
			"base_url": config.BaseURL,
			"model":    config.Model,
		},
	}

	configMap := map[string]interface{}{
		"api_key":  config.APIKey,
		"base_url": config.BaseURL,
		"model":    config.Model,
	}

	return &AnthropicModel{
		apiKey:    config.APIKey,
		baseURL:   config.BaseURL,
		modelID:   modelInfo.ID,
		modelInfo: modelInfo,
		config:    configMap,
	}, nil
}

// GetModelInfo 获取模型信息
func (m *AnthropicModel) GetModelInfo() types.ModelInfo {
	return m.modelInfo
}

// GetProvider 获取提供商
func (m *AnthropicModel) GetProvider() types.ModelProvider {
	return types.ProviderAnthropic
}

// GetType 获取模型类型
func (m *AnthropicModel) GetType() types.ModelType {
	return types.TypeChat
}

// Health 健康检查
func (m *AnthropicModel) Health(ctx context.Context) error {
	// 简单的健康检查请求
	// 这里应该实现实际的Anthropic API健康检查
	logger.Logger.Info("Anthropic health check", zap.String("model", m.modelInfo.Name))
	return nil
}

// Chat 对话
func (m *AnthropicModel) Chat(ctx context.Context, req types.ChatRequest) (*types.ChatResponse, error) {
	// TODO: 实现Anthropic API调用
	// 这里需要根据Anthropic的实际API格式实现

	logger.Logger.Info("Anthropic chat request",
		zap.String("model", m.modelInfo.Name),
		zap.Int("message_count", len(req.Messages)))

	// 模拟响应
	response := &types.ChatResponse{
		ID:      fmt.Sprintf("anthropic-%d", time.Now().Unix()),
		Object:  "chat.completion",
		Created: time.Now().Unix(),
		Model:   m.getModelName(req.Model),
		Choices: []types.Choice{
			{
				Index: 0,
				Message: types.ChatMessage{
					Role:    "assistant",
					Content: "This is a simulated response from Anthropic model. Please implement actual API call.",
				},
				FinishReason: "stop",
			},
		},
		Usage: types.Usage{
			PromptTokens:     100,
			CompletionTokens: 50,
			TotalTokens:      150,
		},
	}

	return response, nil
}

// ChatStream 流式对话
func (m *AnthropicModel) ChatStream(ctx context.Context, req types.ChatRequest) (<-chan types.ChatResponse, error) {
	responseChan := make(chan types.ChatResponse, 1)

	go func() {
		defer close(responseChan)

		// 模拟流式响应
		response := types.ChatResponse{
			ID:      fmt.Sprintf("anthropic-stream-%d", time.Now().Unix()),
			Object:  "chat.completion.chunk",
			Created: time.Now().Unix(),
			Model:   m.getModelName(req.Model),
			Choices: []types.Choice{
				{
					Index: 0,
					Delta: &types.ChatMessage{
						Role:    "assistant",
						Content: "Simulated streaming response from Anthropic",
					},
					FinishReason: "stop",
				},
			},
		}

		select {
		case responseChan <- response:
		case <-ctx.Done():
		}
	}()

	return responseChan, nil
}

// Embedding 向量嵌入
func (m *AnthropicModel) Embedding(ctx context.Context, req types.EmbeddingRequest) (*types.EmbeddingResponse, error) {
	// Anthropic目前不提供嵌入API
	return nil, fmt.Errorf("anthropic does not support embedding")
}

// CallTool 调用工具
func (m *AnthropicModel) CallTool(ctx context.Context, toolName string, params map[string]interface{}) (interface{}, error) {
	// Anthropic工具调用通过chat completion处理
	return nil, fmt.Errorf("tool calling should be handled through chat completion")
}

// UpdateConfig 更新配置
func (m *AnthropicModel) UpdateConfig(config map[string]interface{}) error {
	for key, value := range config {
		m.config[key] = value
	}

	// 更新API key
	if apiKey, ok := config["api_key"].(string); ok {
		m.apiKey = apiKey
	}

	// 更新base URL
	if baseURL, ok := config["base_url"].(string); ok {
		m.baseURL = baseURL
	}

	return nil
}

// GetConfig 获取配置
func (m *AnthropicModel) GetConfig() map[string]interface{} {
	config := make(map[string]interface{})
	for k, v := range m.config {
		config[k] = v
	}
	return config
}

// getModelName 获取模型名称
func (m *AnthropicModel) getModelName(requestModel string) string {
	if requestModel != "" {
		return requestModel
	}
	if modelName, ok := m.config["model"].(string); ok {
		return modelName
	}
	return "claude-3-sonnet-20240229"
}

// getAnthropicModelMaxTokens 获取Anthropic模型最大tokens
func getAnthropicModelMaxTokens(model string) int {
	switch model {
	case "claude-3-opus-20240229":
		return 200000
	case "claude-3-sonnet-20240229":
		return 200000
	case "claude-3-haiku-20240307":
		return 200000
	case "claude-2.1":
		return 200000
	case "claude-2.0":
		return 100000
	case "claude-instant-1.2":
		return 100000
	default:
		return 200000
	}
}

// getAnthropicModelInputPrice 获取Anthropic模型输入价格 (每1K tokens)
func getAnthropicModelInputPrice(model string) float64 {
	switch model {
	case "claude-3-opus-20240229":
		return 0.015
	case "claude-3-sonnet-20240229":
		return 0.003
	case "claude-3-haiku-20240307":
		return 0.00025
	case "claude-2.1":
		return 0.008
	case "claude-2.0":
		return 0.008
	case "claude-instant-1.2":
		return 0.0008
	default:
		return 0.003
	}
}

// getAnthropicModelOutputPrice 获取Anthropic模型输出价格 (每1K tokens)
func getAnthropicModelOutputPrice(model string) float64 {
	switch model {
	case "claude-3-opus-20240229":
		return 0.075
	case "claude-3-sonnet-20240229":
		return 0.015
	case "claude-3-haiku-20240307":
		return 0.00125
	case "claude-2.1":
		return 0.024
	case "claude-2.0":
		return 0.024
	case "claude-instant-1.2":
		return 0.0024
	default:
		return 0.015
	}
}
